Koš (German: Andreasdorf, Hungarian: Kós) is a village and municipality in Prievidza District in the Trenčín Region of western Slovakia.
In historical records the village was first mentioned in 1367.
The municipality lies at an altitude of 270 metres and covers an area of 13.586 km². It has a population of about 900 people.
The records for genealogical research are available at the state archive "Statny Archiv in Nitra, Slovakia"
- Roman Catholic church records (births/marriages/deaths): 1691-1906 (parish A)
Coordinates: 48°45′N 18°35′E / 48.750°N 18.583°E